10th class progressions. find it .
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Answer:
n=5 and an=a5=30
Step-by-step explanation:
so as a5=30
so, tn=a+(n-1)d
so, t5=10+(5-1)d
so, 30-10=4d
so,20/4=d
so,5=d
n is 5 here, and an is a5.
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