Question

15.
Find the square root of a five digit number 49abc where a, b and c are non-zero digits such
that b = a³= 2c
[IOM 2019)
(A) 202
(B) 122
(C) 222
(D) 242​

Answer 1

647

948

271

759

Explanation:

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Answer 2

222

Explanation:

all the options have end digit 2

the answer is the square root of 49abc

so we go c = 4(2²)

2c = a³

2*4 = a³

8 = a³

2 = a

b = a³

b = 8

therefore the 49abc = 49284

√49284 = 222

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