If the following number can be written as the sum of seven different odd number, then the fourth odd number will be 7cube <

Question

If the following number can be written as the sum of seven different odd number, then the fourth odd number will be

7cube

a) 37 or 51

b) 37 or 49

c) 49 or 61

d) 49 or 19

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Raelynn 5 days 2021-09-13T20:42:01+00:00 1 Answer 0 views 0

Answers ( )

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    2021-09-13T20:43:04+00:00

    1. What will be the unit digit of the squares of the following numbers?

    (i) 81(ii) 272(iii) 799(iv) 3853 (v) 1234(vi) 26387(vii) 52698(viii) 99880 (ix) 12796(x) 55555

    Sol: (i) ∵ 1 × 1 = I

    ∴ The unit’s digit of (81)2 will be 1.

    (ii) 2 × 2 = 4

    The unit’s digits of (272)2 will be 4.

    (iii) Since, 9 × 9 = 81

    The unit’s digit of (799)2 will be 1.

    (iv) Since, 3 × 3 = 9

    The unit’s digit of (3853)2 will be 9.

    (v) Since, 4 × 4 = 16

    The unit’s digit of (1234)2 will be 6.

    (vi) Since 7 × 7 = 49

    The unit’s digit of (26387)2 will be 9.

    (v) Since, 8 × 8 = 64

    The unit’s digit of (52698)2 will be 4.

    (vi) Since 0 × 0 = 0

    The unit’s digit of (99880)2 will be O.

    (vii) Since 6 × 6 = 36

    The unit’s digit of (12796)2 will be 6.

    (x) Since, 5 × 5 = 25

    The unit’s digit of (55555)2 will be 5.

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