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

1. 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.