Question

Find the sum of all numbers less than 27 are
divisible by 3.
(a) 115 (b) 84
(c) 108 (d) 110​

Answer 1

Answer:

$\frac{1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 + 21 + 22 + 23 + 24 + 25 + 26}{3}$

$= \frac{351}{3}$

$= 117$

Answer 2

Answer:

=83

Step-by-step explanation:

$a = 3 \\ tn = 27 \\ t1 = 3 \\ sn = a + (tn - t1)d \\ = 3 + (27 + 3)3 \\ = 3 + (30)3 \\ = 3 + 90 \\ \\ = 93$