Question

Which term of the A. P. 4, 7, 10, ..... is 64?​

Answer 1

$\huge\bf\underline{Answer:}$

Given A.P. is 4, 7, 10 ......

$Common\:Difference(d) = 7 - 4 = 3\\</p><p>First\:term(a) = 4\\</p><p>a_n = 64\\</p><p>We\:know \:that\\</p><p>a_n = a + (n - 1)d\\</p><p>64 = 4 + (n - 1)3\\</p><p>60 = (n - 1)3\\</p><p>20 = n - 1$

$\boxed{n = 21}</p><p>$

Therefore, 64 is the 21st term of the given A.P.

@ItsMysteriousGirl✒️