Number of terms common to the two arithmetic progressions 5, 10, 15, ... 315 and 4, 8, 12 ...
604 is:
(a) 13
(b) 14
(c) 15
(d) 16
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number of terms common to the given A.P is 15
so the right option is ( c )
so the right option is ( c )
hyunxu:
pls explain
edit the ANSWEr
1st common number is 20 and 2nd 40........and last is 300 , so a= 20, d= 20 & tn = 300 , tn = a + (n-1) d, 300 =20 + (n-1 )20, 20 +20n -20 =300, 20n =300, n =300/20, n = 15
Wow thank you
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