🎓 Academic (Help) Arithmetic sequences

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Ang formula sa number 2 ay S=n/2 (a1 + (n-1)d) so bali ang n=26(total number of alphabet) a1=a(first term) d=+b(common difference) tapus substitute mo na yan sa formula, S=26/2 (a + (26-1)b) = 13 (a+25b) = 13a + 325b. Di na yung alphabetical table is my 26 if d kasali si "enye" at "NG" pagkasali si
"enye" at "NG" bali 28 alphabetical words, pag wala sa choices yung sagot ko meaning ginamit nya na "n" ay 28 ang sagot naman pag n=28 ay S=S=28/2 (a + (28-1)b) = 14 (a+27b) = 14a + 378b
 
Ay alam ko na madam ung sagot sa number 1, bale an=a1+(n-1)d ang formula so an=ax, a1=a, d=+b and n=24(bilang ng alphabet from a to x). So substitute na ntin, an=a+(24-1)b =a+23b. Pero pag kasali si "enye" at Ng" sa alphabet ibig sabihin n=26(a to x note kasali jan si "enye" at "Ng" so an=a+(26-1)b =a+25b
 
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