Find the sum of the first 60 terms of given A.P. 7,11,15,19,......
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Answer:
3,3,4
Step-by-step explanation:
t1=7, t2=11, t3=15, t4=19
d=t2-t1=11-7=3
d=t3-t2=15-11=3
d=t4-t3=19-15=4
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