Question

Which term of the AP 3;5;7...is 43

Answer 1

Formula to find the term is {An = a + (n-1)d}

a = 3 ( first term )

An = 43 ( last term )

d = 5-3 = 2

n =?

Put the values in the formula

43 = 3 + (n-1)2

43-3 = (n-1)2

40 = (n-1)2

40/2 = n-1

20 = n-1

20 + 1 = n

21 = n

Hence, 43 is the 21st term of this AP.

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Answer 2

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