Question

find the sum of all number from 60 to 350. which are divisible by 6. hence find the 15th and 35th term of that A.p.
plzz solve this question fast i will mark you as brainlist

Answer 1

The no. between 60 and 350 divisible by 6 are
60, 66, ............ 348
This forms an A.P with
a = 60 , and d = 6
Tn( Last term) = a + (n-1)d
348 = 60+(n-1)6
n = 49
Sum = n/2 (a + l)
= 49/2 (60 + 6 )
= 49 × 33
= 1617


T15 = a + 14d
= 60 + 14*6
= 144


T35 = a + 34d
= 60 + 34*6
= 264


Hope this helps you