खालील क्रमिका अंकगणिती श्रेढी आहे का ते ठरवा; असेल तर त्या श्रेढीचे विसावे पद काढा.
-12, -5, 2, 9, 16, 23,30, . . .
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Answer:
d=-5-(-12)=2-(-5)=7
tn=a+(n-1)d
a=-5,n=13,20term
t13=-5+(13-1)7
=79
t20=-5+(20-1)7
=128
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